20721225

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{1361}}^1$

素因数の和:1410

約数の個数: 48

約数和(自身を含む): 40533120

約数和(自身を除く): 19811895

約数列:

[1, 3, 5, 7, 15, 21, 25, 29, 35, 75, 87, 105, 145, 175, 203, 435, 525, 609, 725, 1015, 1361, 2175, 3045, 4083, 5075, 6805, 9527, 15225, 20415, 28581, 34025, 39469, 47635, 102075, 118407, 142905, 197345, 238175, 276283, 592035, 714525, 828849, 986725, 1381415, 2960175, 4144245, 6907075, 20721225]

約数ペア:

[(1, 20721225), (3, 6907075), (5, 4144245), (7, 2960175), (15, 1381415), (21, 986725), (25, 828849), (29, 714525), (35, 592035), (75, 276283), (87, 238175), (105, 197345), (145, 142905), (175, 118407), (203, 102075), (435, 47635), (525, 39469), (609, 34025), (725, 28581), (1015, 20415), (1361, 15225), (2175, 9527), (3045, 6805), (4083, 5075)]